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nimh battery drain rate? (storage)

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#1 metalclash

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Posted 21 March 2013 - 01:28 PM

Hey all, just wondering how much a nimh battery discharge's when it's in storage.  I read on wikipedia that the day after it's charged it can lose as much as 20%? Is that really true?  And if so, should I just always charge all my batteries the night before?

#2 Chuck S

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Posted 21 March 2013 - 03:08 PM

Actually the Wiki states they can lose 20% the first day!

I just measured a pair of 8.4v NiMH batteries last charged maybe in January.  Both were about 9.15v.  These must be low self discharge (LSD) types common the past few years.

-- Chuck

#3 kwaispro727

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Posted 21 March 2013 - 04:23 PM

I usually charge all of my batteries the night before but sometimes if I forget one I charge it in the car :)

#4 Chuck S

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Posted 22 March 2013 - 03:30 AM

Fully charged 8.4v NiMH battery measured 9.89v this morning right off the charger.

Will let her sit 24 hours and measure again.

Yes, this is really an 8.4v battery.  Seven (7) 1.2v cells.  It seems the cells charge to 1.4v.  Curious, perhaps.  We'll see what the voltage is tomorrow morning.

-- Chuck

#5 metalclash

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Posted 22 March 2013 - 09:59 AM

View PostChuck S, on 22 March 2013 - 03:30 AM, said:

Fully charged 8.4v NiMH battery measured 9.89v this morning right off the charger.

Will let her sit 24 hours and measure again.

Yes, this is really an 8.4v battery.  Seven (7) 1.2v cells.  It seems the cells charge to 1.4v.  Curious, perhaps.  We'll see what the voltage is tomorrow morning.

-- Chuck

Wow... thanks for testing!  I appreciate the effort you're putting into my question!

I know most of my batteries will hold a charge for a long time, or so it seemed, but I just wanted to make sure I wasn't putting half charged batteries in my gun.

#6 Chuck S

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Posted 22 March 2013 - 02:16 PM

The only time I replace or charge a battery is when the gun starts to gag or the LiPO alarm goes off.  But I don't game my guns so a suddenly dead battery is of no consequence.

-- Chuck





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